Test Device for Use in a Test System for Checking Transmission Procedures in a Mobile Telephony Network

1. A test device ( 1 ) for use in a test system for checking transmission procedures in a mobile telephony network, comprising a mobile telephone ( 2 ) configured such that it is able to communicate with a subscriber identification module (SIM), and comprising a SIM simulation processor ( 4 ) locally associated with the mobile telephone ( 2 ), to prepare a SIM simulation, the SIM simulation processor ( 4 ) being designed to be connected to other components of the test system, wherein the test device ( 1 ) also has a physical SIM card ( 10 ) connected to the SIM simulation processor ( 4 ) such that the mobile telephone ( 2 ) is able to communicate selectively with the SIM simulation or with the physical SIM card ( 10 ), wherein the physical SIM card ( 10 ) is connected to a voltage source ( 15 a ) of the mobile telephone ( 2 ).

2. A test device according to claim 1 , wherein an input and output line ( 12 ) between the physical SIM card ( 10 ) and the SIM simulation processor ( 4 ) is connected to an input and output line ( 5 ) between the SIM simulation processor ( 4 ) and the mobile telephone ( 2 ) via a switch ( 17 ) which may be activated by the SIM simulation processor ( 4 ).

3. A test device according to claim 1 , wherein the SIM simulation processor ( 4 ) has a monitoring module ( 20 ) for monitoring a communication of data between the physical SIM card ( 10 ) and the mobile telephone ( 2 ).

4. A test device according to claim 1 , wherein the SIM simulation processor ( 4 ) has an emulation module ( 21 ) configured such that it suppresses specific communication elements of a data communication between the physical SIM card ( 10 ) and the mobile telephone ( 2 ) and replaces them by communication elements of a data communication between the SIM simulation and the mobile telephone ( 2 ).

5. A test device according to claim 1 , wherein the SIM simulation processor ( 4 ) has a compatibility module ( 22 ) configured such that a communication of data is allowed between the physical SIM card ( 10 ) and the mobile telephone ( 2 ) even if a direct communication of data between the physical SIM card ( 10 ) and the mobile telephone ( 2 ) is impossible due to these components being incompatible.

6. A test device according to claim 1 , wherein the SIM simulation processor ( 4 ) has a control module ( 15 e ) to activate a selection switch ( 15 c ) for presetting one of a plurality of possible voltage sources ( 15 a , 15 b ) or voltage levels.

7. A test device ( 1 ) for use in a test system for checking transmission procedures in a mobile telephony network, comprising a mobile telephone ( 2 ) configured such that it is able to communicate with a subscriber identification module (SIM), and comprising a SIM simulation processor ( 4 ) locally associated with the mobile telephone ( 2 ), to prepare a SIM simulation, the SIM simulation processor ( 4 ) being designed to be connected to other components of the test system, wherein the test device ( 1 ) also has a physical SIM card ( 10 ) connected to the SIM simulation processor ( 4 ) such that the mobile telephone ( 2 ) is able to communicate selectively with the SIM simulation or with the physical SIM card ( 10 ), wherein an input and output line ( 12 ) between the physical SIM card ( 10 ) and the SIM simulation processor ( 4 ) is connected to an input and output line ( 5 ) between the SIM simulation processor ( 4 ) and the mobile telephone ( 2 ) via a switch ( 17 ) which may be activated by the SIM simulation processor ( 4 ).